WAHYUDIANDRI, DARYL (2020) ANALISA PERBANDINGAN LAJU KOROSI HOT DIP GALVANIZING DAN COLD ROLLED PADA LARUTAN NaCl 5% DAN AIR DENGAN METODE KEHILANGAN MASSA. S1 thesis, Universitas Mercu Buana.
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Abstract
Corrosion is one of the most challenging thing in the manufacturing process. Previously, automotive manufacturers chose to use cold roll made from carbon steel which is relatively cheap and with the consideration that the car will have more layers to prevent corrosion. Hot dip galvanizing is the method deemed most suitable to be implemented in the automotive manufacturing process because of lower production costs. Hot dip galvanizing is a coating of steel sheets by dipping the base metal in a hot zinc pot and then annealing process deletions. The materials that used in this test are cold rolled (MC27D) and hot dip galvanizing. Hot dip galvanizing divided into two types of materialas, there are hot dip galvanized (GI) and hot dip galvanealled (GA). Hot dip galvanized material uses chromate surface treatment (ZC27C), while hot dip galvanealled material uses chromate (GC27C) and L-treatment (GC27D) surface treatment. The four materials were tested by 5% NaCl solution, fresh water, and ambient temperature. The material sample will compared the weight difference and get the corrosion rate by using weight losss method. From the result have obtained the results of ZC27C material has a lowest corrosion rate of 1.950 mg m2 ⁄ . hours at NaCl 5%, 1.360 mg m2 ⁄ . hours in fresh water and 0.227 mg m2 ⁄ . hours at ambient temperature. The average ZC27C material reduces more than 90% corrosion rate compared to cold rolled material in all treatments. Keywords: Corrosion, cold roll carbon steel, corrosion protection, hot dip galvanizing, corrosion rate, weight loss method, SEM-EDX. Korosi merupakan hal yang harus dihindari dalam sebuah proses manufacturing terutama pada proses manufaktur otomotif. Sebelumnya produsen otomotif memilih menggunakan cold rolled baja karbon yang relatif murah dan dengan pertimbangan sebuah mobil akan memiliki banyak lapisan lagi untuk mencegah korosi. Hot dip galvanizing merupakan metode yang dirasa paling cocok untuk di implimentasikan pada proses manufaktur otomotif karena biaya produksi yang lebih murah Hot dip galvanizing merupakan pelapisan lembaran baja dengan mencelupkan logam induk dalam kolam zinc. Material yang digunakan pada pengujian ini adalah cold rolled (MC27D) dan hot dip galvanizing. Hot dip galvanizing yang diuji dibaga menjadi dua jenis yaitu hot dip galvanized (GI) dan hot dip galvanealled (GA). Material hot dip galvanized menggunakan chromate surface treatment (ZC27C), sedangkan material hot dip galvanealled menggunakan chromate (GC27C) dan L-treatment (GC27D) surface treatment. Keempat material tersebut di uji dengan perlakuan larutan NaCl 5%, air tawar, dan temperatur lingkungan. Laju korosi material tersebut dihitung dari perbedaan berat material menggunakan metode kehilangan massa. Dari hasil pengujian didapatkan hasil material ZC27C memiliki laju korosi sebesar 1,950 mg m2 ⁄ . jam pada NaCl 5%, 1,360 mg m2 ⁄ . jam pada air tawar dan 0,227 mg m2 ⁄ . jam pada temperatur lingkugan. Rata-rata material ZC27C mereduksi lebih dari 90% laju korosi dibandingkan material cold rolled dalam segala perlakuan. Kata Kunci: Korosi, cold roll baja karbon, proteksi korosi, hot dip galvanizing, laju korosi, metode kehilangan massa, SEM-EDX.
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